A C/C composites for piston with obvious anisotropy was prepared.The microstructure of the composites was characterized by metallographic microscope and scanning electron microscope.The tensile strength

thermal expansion coefficient and friction-wear properties of the composites were investigated.The results show that as the piston C/C composites

chemical vaporization infiltration（CVI）is used to prepare the deposited carbon with rough laminar structure to improve its thermal conductivity and avoid the smooth structure of sedimentary carbon.At room temperature

the tensile strength of the composites at the X and Z directions exhibits desirable

about 400 MPa.The thermal expansion coefficient at the X and Z directions is less than 0.5×10

-6

K

-1

while the thermal expansion coefficient at Y direction is closed to zero.Long fiber coiled C/C material has the higher wear resistance than high nickel cast iron.